thumb|Icelandic grimoire, "Galdrabók" (), belonging to Swedish History Museum (signum: ATA Ämb 2 F16:26) A grimoire (), also known as a book of spells, magic book, or a spellbook, is a textbook of
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bc9f79778cbefe321ee2f1dd65e2683e9e0afba47420319723e6439e8468f17. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/804021a8-de5f-47ca-bf43-39b314a1a5df.json and https://artists.proofprofile.net/proofs/artist/804021a8-de5f-47ca-bf43-39b314a1a5df.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).